The best way to mount an outdoor mosaic mural is to use thinset mortar and mount it directly to a brick, stone, or concrete wall.
You can make mosaic murals on foam-core backer board and mount these backers onto wooden fences with screws, but that is less than ideal for several reasons, and the weight could cause the fence to lean if its posts aren’t securely anchored. That is why we recommend mounting mosaics directly on masonry surfaces (brick, stone, or concrete).
Masonry surfaces need to be cleaned and possibly smoothed before the mosaic is mounted, but that isn’t too difficult, and it is well worth doing if you want the mosaic to last any time at all. Continue reading